ARG
    $1 name_file for search in pwd  or extend files [, param once after $1] 

PARAM
    single mode:
        [name.ext] search exactly name
        [name] search all files ( with any extends )
    param mode:
        -g grep in name files (return : menu with path_names)
        -e search for extend files (return : menu with path_names)

RET
    NUL (if result empty)
    path_to_file (in single mode)
    menu path_to_file (in param mode)